Download the UM2134C-3W datasheet PDF.
This datasheet also covers the UM2100-3W variant, as both devices belong to the same 3 watt dc-dc converters family and are provided as variant models within a single manufacturer datasheet.
Note: The manufacturer provides a single datasheet file (UM2100-3W-UniversalMicroelectronic.pdf) that lists specifications for multiple related part numbers.